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Multiple Choice Quiz
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1

Which of the these describes the tendency of galaxies to form in groups
A)galaxies are only found singly
B)galaxies are found only in small groups of a few members
C)galaxies are found both in small groups and large clusters
D)galaxies were in groups only in the early universe
2

The Local Group is:
A)a group of about 30-50 galaxies containing the Milky Way galaxy
B)the local group of Population II stars in the solar neighborhood
C)a large supercluster of galaxies centered on the Milky Way
D)all stars within 10 pc. of the sun
3

Which of the following statements about the Local Group of galaxies is true?
A)it contains a few dozen galaxies
B)the Milky Way is the only large spiral galaxy in the Local Group
C)the Virgo cluster is part of the Local Group
D)the galaxies in the Local Group are all rushing toward the Milky Way
4

Which of the following types of galaxies make up the majority of the members of the local group?
A)elliptical
B)spiral
C)barred spiral
D)irregular
5

The Virgo Cluster of galaxies is receding from us at about 1500 km/sec. How does its distance compare with the diameter of the Milky Way galaxy?
A)its distance is about ten times the diameter of the Milky Way
B)its distance is about 50 times the diameter of the Milky Way
C)its distance is about 500 times the diameter of the Milky Way
D)its distance is about 10000 times the diameter of the Milky Way
6

What type of galaxy is frequently found at the center of a rich cluster of galaxies?
A)elliptical
B)spiral
C)barred spiral
D)irregular
7

There is often a giant, dominant elliptical at the center of galactic clusters. It is thought to arise from:
A)a collection of black holes at the center
B)large amounts of hydrogen gas collecting in the core
C)gravitational effects of the local supercluster
D)tidal interactions among members of the cluster
8

A cluster of galaxies is consider rich if
A)it contains more helium than hydrogen
B)it has a large number of galaxies
C)a large fraction of its mass consists of hot intergalactic gas
D)it contains numerous quasars
9

Evidence for 'invisible' matter between galaxies in clusters (intracluster matter) is provided by:
A)the rotation curves of clusters are flatter than Keplerian
B)absorption lines in the spectra of cluster members
C)star formation regions between galaxies in clusters
D)x-ray emission from a halo of gas centered on the cluster
10

Which of the following statements best describes the distribution of galaxies in the universe?
A)the galaxies lie on sheets and chains surrounding empty regions
B)the galaxies are distributed uniformly in space
C)there are a few large clusters of galaxies with nothing in between
D)there are many clusters near us in space, but nothing beyond





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